First time grower

Everything was going fine till a few days ago but then this started to happen what would yous suggest I'm doing wrong as said it's my first time or am I doing ok so yeah

What medium?
What food?
What ppm?

We need more info, bro.

It's a dwc system with a mix of charcoal and vermiculite and I'm using 3 quarters liquid thrive to 1/4 part 1 part 2 powder hydroponic solution and ph is around 6.0

If you're talking about the burnt leaf tips; you kissed them a little too much. Just ratchet back your feed some and you should be fine. They look a good ways into flower...generally at this point the plants slow down and therefore need less. I wouldn't sweat it. Good luck friend.

Canna country thanks heaps man its good to hear their doing ok it's a lil stressful first time round and helpful when you have peeps like you to help I'll change out half the water would be the best thing to do or what

Jewish said:

Canna country thanks heaps man its good to hear their doing ok it's a lil stressful first time round and helpful when you have peeps like you to help I'll change out half the water would be the best thing to do or what

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Not knowing exactly what you're doing, it's hard for me to say. If you know your EC or PPM, I'd just cut it back some. If you don't, then cut back on the amount of nutrients you're using. Long story short, I'd simply cut back on their feed concentration; however you feel is best to accomplish this. And I wouldn't cut it drastically...maybe 25% at most.